I tried liking KF2 but it just lacks the crispness and the atmosphere of KF1. I also missed the shop lady with her opening shop in the weirdest locations in between rounds. So yeah, KF2 lacks charm IMO and I still like KF1 more even on its aging UE2.5 engine. I don’t think KF3 will find my interest, with all the multiplayer games going “live service” and all.
Lead ain’t that dangerous. Just take it out and dispose of it like you do with normal batteries. Clean your hands afterwards and you’re dandy. As for the clock, the battery contacts, and whatever they were attached to, are likely eaten away, but I can’t say that for certain from this photo. If you’re lucky and they’re mostly intact, some IPA scrubbing and a dip in vinegar, and a bit more scrubbing, should take most of the crust away. That rust though, probably some vinegar, maybe a deoxidating agent (like navy jelly?) could clean it off. Even cleaning all of it doesn’t guarantee that it’ll work any way.